The Re(I) complexes bearing 2,6-bis(7′-azaindolyl)phenyl ligand as a tridentate ligand were synthesized by treatment with Re2(CO)10. The structures of the complexes were confirmed by X-ray crystallography. Both 7-azaindolyl ligands of Re(I) complexes are present in butterfly forms. The Re–Cipso bonds showed a partial double bond character by π back-donation between the phenyl moiety and Re atom. In